Tool apparatus



May 8 1945.

E. J. HART TOOL APPARATUS Filed Feb. 8, 1944 Patented May 8,1945

Pii'rliiN TOOL APPARATUS I J. Hart, Springfield, Masai f' r 1 I Application February 8, 1944, Serial No: 521,532 iciaim. (g1. 5 1- 22'1)Q This invention relates to -tooi 'apparatus and is directed more particularly to improvements in holders for tools or tool-bits.

The principal objects of the invention are directed to improvements in devices for holding tools known as tool-bits to facilitate forming the working portions thereof.

Tool bits having working portions are used in tool holders of machine tools and the principal features of this invention are the provision of a device in which a tool-bit may'be clamped so that the working part of the bit ma be positioned for the action of an abrasive wheel or the like to form the workin part.

The device of the invention is in the form of a holder provided with slots for receiving a bit that are so relatively disposed as to present the working part thereof to an abrasive wheel for obtaining various cuts on the tool bit and the holder is formed so that it varies the position of the working part of the tool bit. The form of the holder and the bit slots thereof cooperate whereby the working part of a tool bit may be formed by shifting the bit between the slots and supporting the block on its different sides.

Various novel features and advantages of the invention will be hereinafter more fully referred to in connection with the following description I of the invention in the form at present preferred tool-bit or bits such as 20 Means'is-provided for clamping the bit or bits in the slots 'whiclr may take-the form of set screws 22in threaded; engagement with the block that" are adapted to abut a bit and bind it against a side of a slot.

\ The block 2 willpreferably be made from ferrous metal so that it may be engagedby the magnetic member or chuck of a machine wherein the chuck and thereby the block 2 and an element for acting on a bit in the block are relatively movable. In this way an element which may be an abrasive wheel is caused to act on the working end part of the tool bit to form the same. v

The device may be used in various ways, that is a tool-bit or bits may be clamped in the slots and the block may be positioned so that the working end of a tool bit may be presented to an abrasive member in various relations. The

following will, however, explain some of the uses for which the device is adapted.

With the block 2 held on a magnetic chuck in theposition shown in Figs; 2 and 4 the block is tilted forwardly, as shown and a bit 20. is clamped in a slot such as l2. The end of the bit is presented so that as the block and an abrasive wheel represented by 26 are moved relative to one another the wheel acts to produce an angle or side such as 24 on the end of the bit which extends rearwardly from the point of. the bit;

The bit is inserted in the slot l4 so that angle -28 is similarly produced.

The holder of the invention includes a body in the form of a block 2 which has supporting faces 4 and 6, the former of whichis non-parallel to the face 6 and is not at right angles to the front and rear faces 8 and l0.

Slots l2 and I4 for receiving a tool bit or bits are provided in the forward face of the body that intersect, as shown, and are diagonally disposed relative to the supporting faces 4 and 6. A similar slot H5 in the forward face adjacent the supporting face 4 is arranged angularly rel- I atively to said face 4 and to the face 6, as shown.

the block 2.

As shown in Fig. 6, the point of the bit below the upper forward end inclines downwardly and rearwardly as shown in Fig. 6, due to the tiltof Then the block is inverted with its face 6 on the chuck as shown in Figs. 1 and 2 so that with the tool-bit clamped in the slot It, the block and Wheel 26 are relatively moved so that the .wheel 1 acts on the upper side of the point of the bit to produce an upper surface 20 which inclines downwardly and rearwardly from the point.

Where it is desired or necessary it is possible v tofirst producethe angular sides of the point such as 20 and 28. In such a case the bit is clamped in the slots l2 and I4 as shown in Fig. 1

for the action of the wheel subsequent to which the block may be reversed to produce the point as it is shown in Fig. 6. Where this procedure is followed, other set screws than shown may be provided.

The slots for the tool-bit are relatively dis posed and the block is formed for a cooperative The slots described are adapted to receive a function so that a tool-bit may be acted upon by an abrasive wheel to produce the desired form I of cutting tool.,

Th invention may be embodied in other specific forms without departing from the'essential characteristics thereof. Hence, the present embodiments are therefore to be considered in all 1 respects merely as beingillustrative and not as i being restrictive; the scope of the invention being i indicated by the appended claim rather than by the'foregoing descriptionfand'all modifications and variations as jfall within the meaning :and

braced therein. y What it is desired to claim and secure byLet 1 .t rs Patent of the United States is: I

A device for holding a tool-bit and appease 1 i purview and range. of equivalency of the ap- I pended claim are therefore intended to beemv face of a bit'projecting from the block may be presented to said wheel'at a. certain angle, and clampmeans adapted to project into said grooves 'for'engaging and clamping a bit'therein, said upper, face arranged when the block is supported parallel relation to said lower face and inclining the same on a flat horizontal surfaceiso-that i periphery of an abrasive wheel rotatable on "a l end portionsof said bit are presented to the 20 horizontal, axis comprising in combination a rectangular shaped lblOCk having front, v-rear, end and upper and lowersupporting-faces; said? lower;v facedisposed: at right anglesto said front) forwardly fromsaid rear to said front face, said forward face provided with lower'relatively angu-- larly disposed intersecting grooves extending from end to end of the block-for holding a tool bit so that when said block is supported by its lower face opposite sides of the end of a bit projecting from the block may be presented to said wheel at certain angles and an upper groove disposed longitudinally fand ,angularlyr relative to said lower face'to hold a bit." so that when the block is supportedon its lower'face the upper thereby to .tilt the same forwardly whereby a bit in adiagonal groove has its end portion projecting from the block presented to the periphery of a wheel at another certain angle. I

f eE wARD ia 

